Hello,
Today, I will introduce you the technology of the access network, which is PON.
Passive Optical Network (PON) mainly uses a passive optical power splitter (coupler) to send information to each user. Because the optical power divider is used to reduce the power, it is more suitable for short distance use.
PON (passive optical network) refers to ODN (optical distribution network) does not contain any electronic devices and electronic power, ODN is composed of passive devices such as optical splitters (Splitter), does not require valuable active electronic equipment. A passive optical network includes an optical line terminal (OLT) installed in a central control station, and a set of matching optical network units (ONUs) installed in a user's premises. The optical distribution network (ODN) between the OLT and the ONU contains optical fibers and passive optical splitters or couplers.
Development of PON technology
APON (ATM PON)
It was proposed in 1995. In 1996, 13 large-scale network operators and their major equipment suppliers formed the FSAN (Full Service Access Network) alliance, 155Mb / s PON system technical specifications, ATM transmission protocol, ITU-T G.983 Series standards
BPON (Broadband PON)
In 2001, the APON standard was later strengthened to support a transmission rate of 622Mb / s. At the same time, it added dynamic bandwidth allocation and protection functions, and could provide services such as Ethernet access, video transmission, and high-speed leased lines. Broadband PON
GPON (Gigabit PON)
The FSAN Alliance conducts research on PON standards at rates above 1Gb / s, hoping to propose a solution that, in addition to being able to run at higher speeds, also needs to be more efficient than other PONs in terms of multi-service, OAM & P, and scalability high. This research led to the emergence of Gigabit PON (GPON). In January 2003, ITU-T approved and established the GPON standards G.984.1, G.984.2, and G.984.3
EPON (Ethernet PON)
It is a new type of optical fiber access network technology. It adopts point-to-multipoint structure and passive optical fiber transmission to provide a variety of services on the Ethernet. It uses PON technology at the physical layer, uses the Ethernet protocol at the link layer, and implements Ethernet access using the PON topology. Therefore, it combines the advantages of PON technology and Ethernet technology: low cost; high bandwidth; strong scalability, flexible and rapid service reorganization; compatibility with existing Ethernet; convenient management, etc.
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